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Convertto

Video to MP3 Converter

Extract the audio track from a video and save it as MP3, WAV, AAC or OGG.

To extract audio from a video, add the file and choose an output format. The video stream is discarded and the audio is re-encoded to MP3, WAV, AAC or OGG at your chosen bitrate. Everything runs locally, so the video is never uploaded.

Runs in your browser
Engine
FFmpeg compiled to WebAssembly
First run
Downloads ~30 MB of FFmpeg core, then cached
Upload
None — the file never leaves your device
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

What bitrate should I use?

192 kbps is transparent for most listeners on most material. 320 kbps is the practical maximum for MP3, and 128 kbps is fine for speech and podcasts where file size matters more.

Why is the first run slow?

The FFmpeg WebAssembly core is about 30 MB and downloads once per session. After that it stays in the browser cache, and subsequent conversions start immediately.

Is my video uploaded anywhere?

No. FFmpeg runs inside your browser as WebAssembly, so the file is read from disk into memory and never sent to a server. That is also why there is no file size limit beyond your available RAM.

Why is it slower than desktop FFmpeg?

WebAssembly runs single-threaded here and cannot use your GPU, so encoding is typically several times slower than a native build. For a short clip that is fine; for a feature-length film, use desktop FFmpeg.

How to use the video to mp3 converter

  1. 1Select your video file — the file stays on your device and is never uploaded.
  2. 2Choose the audio format.
  3. 3Choose the bitrate.
  4. 4Press Run, then download the result when it is ready.

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Put the working video to mp3 converter on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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